Liquid pump



Patented May 2, 1944 v LIQUID PUMPv Maurice J. Corp, LosAngeles, Calif., assigner to Thompson W.,Burnam, Whittier, Calif.

Application August 4, 1942, serial No. 453,496.

1 Claim.

This invention relates to an air equalizer guny or hand pump for pumping water to a nozzle. The pump of the present invention is primarily designed for use as an emergency re ghting apparatus, but is susceptible of various uses.

The primary object of the present invention is to provide a simple combination and arrangement of valves and parts which will enable a hand pump to be capable of self-priming, even When operated at large elevations relative to the source of water, and to provide such a hand pump which is capable of delivering a continuous stream with intermittent operation of the pumping barrel.

The hand pump of the present invention is characterized by the inclusion of a novel form of check valve formed of rubber, which permits considerable pressures to be developed on the discharge side of the pump and also permits high vacuum to be developed on the intake side of the pump. The pump, therefore, may be self-primed at considerable elevations from the source of water.

A further feature of the present invention is the inclusion on the discharge end of the pump of a large compression dome, in which the liquid drawn by the pump may be placed under considerable pressure and from which the liquid may flow continuously during the intermittent operation of the pump. The pump of the present invention, therefore, enables liquid to be supplied to a lire extinguishing nozzle, if desired, under suiiicient pressure for properly and continuously operating the nozzle.

Further features of the present invention reside in the manner of construction, by which the inlet and dome or reservoir of the pump are built in the form of a single member shaped to provide a proper handle for the pump.

The pump of the present invention, together with various further objects and advantages of the invention, will best be understood from the following description of the preferred form or example of the pump embodying the invention, and for this purpose I have described the invention in connection with the accompanying drawing, in which The gure is a side elevation in section.

Referring to the drawing, the pump includes a body member 2, the upper end of which is enlarged to provide a reservoir 3 of dome shape. At the top of the dome-shaped reservoir there is provided a plug 4, which may be removed for the purpose of facilitating cleaning the device. A tortuous passage 5 is provided connecting the reservoir 3 with a horizontal bore the body.,

which tortuous passage 5 isso arranged thatl when the reservoir 3 is partially filled with liq-` uid the pump may. beoperated' in Va'vwide varietyv of positions without breaking the liquid seal between the reservoir 3 and horizontal bore 6. The horizontal bore 6 is provided with threads 'I for receiving a threaded plug 8, which forms part of the valve. The plug 8 has the iiange 9 which serves to grip the inner end of a rubber member I0, which provides a rubber nipple which has been pierced axially, as indicated at II. The rubber nipple is normally closed and pressure of uid outside of the nipple operates to assist the closing of the nipple so as to prevent a tight seal against the iiow of fluid through the nipple to the right, as viewed in the gure, but the elastic character of the member I0 permits an expansion of the nipple at perforation II to provide for ready flow of iiuid through the nipple to the left, as viewed in the figure.

The valve thus described is, therefore, capable of aiording an exceptionally tight seal towards the flow of fluid in one direction while offering slight resistance to the ow of fluid in the opposite direction. The plug 8 further forms a seat for a coil spring I2 which acts as a buffer for absorbing the shock of the piston I3 of the pump. To the body 2 there is threaded a pump barrel I4, within which the piston I3 is adapted to be reciprocated by means of the handle I5 attached to the piston. A cap I6 supporting packing I'I is provided on the barrel I4 and the cap I6 also retains one end of a spring I8 coiled around the piston I3. The piston I3 is provided with a cap I9 closing the inner end of the piston, which cap provides a shoulder for engagement with the spring I8 at the end of the stroke of the piston. The springs I8 and I2 of the pump are thus effective for absorbing any impact at the ends of the stroke of the pump and smooth and facilitate the operations of the piston.

The body 2 of the pump is provided with an angled extension 2Il having an inlet bore 2| communicating with the horizontal bore 6 back of the discharge valve 8. The extension 26 is suitably threaded, as indicated at 22, by means of which attachment may be made to a hose lead ing to a water supply. The extension 29 is fur ther threaded, as indicated at 23, to a valve plug 24, which is provided with a retaining iiange for holding a rubber valve member 25 in position. This rubber valve member is provided with a nipple 26 extending inwardly and said nipple is pierced axially, as indicated at 2l'. This valve operates in a manner identical to the one previously described to permit the flow of fluid into the pump and to oppose its flow in the opposite direction. The body I is also indicated as threaded at 28 to a pipe 29 which may lead to a refighting nozzle (not shown) or any other preferred fog or spray nozzle.

In the operation of the pump of the present invention a hose is attached to the threads 22 and may lead to any desired source or basin of Water which may be disposed at an elevation as much as tWenty-ve feet from the position of operation of the hand pump. The pump is self-r Y Y priming, even at such elevations, because of the i effective action of the valves. Once the Water` supply has been primed to the pump the Water drawn by the pump is forced into'the reservoir 3 by the pressure developed by the pump compressing any air entrapped therein. Very high pressures are obtained in operation, such for eX-' ample as 100 pounds per square inch, and from the reservoir 3 in practice there will be a continual delivery of water through the pipe 29'to the re extinguishing nozzle during the reciprocatingV actions of theplunger I3. Y

While the particular form of device herein described is well adapted to carry out the objects oi the present invention, it is to be understood that the invention is capable of modifica- 5 tion and includes all such modications and changes as come Within the scope of the appended claim.

I claim:

A pump adapted to be carried by one hand of l0 the operator for delivering a continuous fluid stream, which pump comprises a body having an air reservoir chamber into which fluid from the pump may be forced under pressure, said body having a handle-shaped extension providing an 15 inlet to the pump, an inlet valve disposed within said inlet and an outlet valve provided Within said body, each including a pierced rubber nipple, the air reservoir chamber communicating with the outlet valve through a tortuous passage, 20 a barrel rigidly attached to said body and connected between the inlet and outletvvalve of said body, and a hand reciprocating piston mounted Within said barrel. e 25 MAURICE J. CORP. 

